Definition - What does Vishnu Sahasranama mean?
The "Vishnu Sahasranama," or the "Thousand Names of Vishnu," is a list of one thousand names for the Hindu god, Vishnu. This list is arranged in the form of a devotional song of praise and is widely used as a chant by Vishnu devotees.
As a chant, the "Vishnu Sahasranama" appears in the "Mahabarata" by Sri Veda Vyaasa. The narrative follows the commentary of Shankaracharya.
Yogapedia explains Vishnu Sahasranama
The "Mahabarata" states that Acharya Sankara found his guru, Sri Govindapaachaarya, and learned much from his wisdom. In order to impress his teacher, Sankara undertook the task of writing out a full commentary on the "Vishnu Sahasranama" in the 7th century.
Habitual chanting of this text is said by devotees to bring numerous benefits, many of which could be of interest to the yogi looking for spiritual growth. These include gaining pleasure and happiness, acquiring righteousness, and gaining energy and strength.